Sewing machine



FIG. 1 is a top plan view of a sewing machine, showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a front perspective view thereof;

FIG. 8 is a rear perspective view thereof, the handle shown in an alternate position. 

The ornamental design for a sewing machine, as shown. 